Provide an accurate BASE when building the latest image #1435

Job	Run time
List perl versions [bookworm]	4s
List perl versions [buster]	5s
List perl versions [bookworm defaults]	4s
Build latest (buster)	21s
Build latest (bookworm)	2m 30s
Build latest	2m 47s
Build versions for bookworm (5.36, 5.38, 5.40, false)	3s
Build versions for bookworm (5.42, true)	7s
Build versions for buster (5.10)	19s
Build versions for buster (5.12)	22s
Build versions for buster (5.8)	17s
Build versions for buster (5.16)	19s
Build versions for buster (5.14)	18s
Build versions for buster (5.18)	19s
Build versions for buster (5.20)	16s
Build versions for buster (5.22)	16s
Build versions for buster (5.24)	16s
Build versions for buster (5.32)	20s
Build versions for buster (5.36)	21s
Build versions for buster (5.38)	19s
Build versions for buster (5.40)	16s
Build versions for buster (5.28)	19s
Build versions for buster (5.26)	17s
Build versions for buster (5.34)	17s
Build versions for buster (5.30)	20s
	11m 12s

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